Depends on your existing wiring mate.
If it's reasonably new and wired in twin and earth cable it's easy.
If it's old single core cables in metal conduit then it'll be a pain in the arse.
PVC twin and earth - Easy
VIR (vulcanised Indian Rubber) - Pain in the arse!!
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The lathe and plaster ceiling suggests an old house which in turn suggests possible old wiring. Also only having 1 twin and 1 single socket in a living room suggests it's quite old.
Any ideas if it's been rewired at any point recently?